structural data obtainable

Ten new chromone derivatives were synthesized from the original 2-4-6- trihydroxyacetophenone using microwave irradiation. The product's structures were confirmed by FT-IR, 1H-NMR, and 13C-NMR spectra data. The anti-microbial activities of the obtained compounds were tested by the disc diffusion method. The results showed that most chromones have significant biological activities against Candida albicans.

10p viambani 18-06-2024 1 0   Download

The article presents the results of an economic and statistical analysis of the effect of zonal conditions on the supply chain (supply chain) of products, production and cost of products for growing and fattening cattle separately from dairy and meat cows. Typological groupings of agricultural organizations of the Republic of Bashkortostan based on average annual data for 2014-2016 were used as a toolkit of analysis, which made it possible to obtain more reliable estimates compared with the grouping for a particular year.

11p longtimenosee10 26-04-2024 2 1   Download

This study aimed to examine the role of entrepreneurship education in increasing entrepreneurial intention among business students. The data were obtained from 240 business students in Indonesia using a questionnaire. The study was conducted using descriptive methods and Structural Equation Modelling (SEM).

14p viarnault 25-04-2024 1 1   Download

This study aimed at exploring teachers’ perceptions of reflective teaching strategies in their teaching practice and the barriers that hinder the implementation of reflective teaching strategies. Quantitative and qualitative data were obtained by using a questionnaire and semi-structured interviews.

13p viarnault 25-04-2024 1 1   Download

This study aims to analyze the factors that influence the level of production and the level of production efficiency of the milkfish pond farming in Demak Regency, Central Java Province, Indonesia. The research sample was 160 milkfish farmers who were selected by survey method through interviews with respondents using structured questionnaires to obtain primary data.

8p longtimenosee06 27-03-2024 4 2   Download

The study aims to explore the factors affecting students’ decision to choose a university at Vietnam National University, Hanoi (VNU). The study uses the Partial Least Square- Structural Equation Model (PLS-SEM) to test the fit of the model and the research hypotheses with the analytical data obtained from 460 first-year students of member universities and faculties under VNU.

15p vimichaelfaraday 28-12-2023 7 5   Download

In this paper, an analysis of nearly 400 students’ records across 7 semesters of the same major in Hanoi University of Science and Technology is presented. Because of the university privacy policy, it is impossible to obtain students information other than their academic results.

5p vifalcon 18-05-2023 5 2   Download

An important feature in many genomic studies is quality control and normalization. This is particularly important when analyzing epigenetic data, where the process of obtaining measurements can be bias prone.

6p vihagrid 30-01-2023 9 3   Download

In present paper "Equation of state and thermal expansion of metals with FCC structure: Application to Cu, Al and Ni", by the statistical moment method (SMM) we obtain the equation of state for metals with cubic structure at temperature 0 K and pressure P and from that obtain the expressions of lattice parameter and thermal expansion coefficient for these metals at temperature T and pressure P.

6p runordie3 27-06-2022 12 2   Download

Org 25435 is a new water-soluble alpha-amino acid ester intravenous anaesthetic which proved satisfactory in animal studies. This study aimed to assess the safety, tolerability and efficacy of Org 25435 and to obtain preliminary pharmacodynamic and pharmacokinetic data.

11p viisaacnewton 26-04-2022 11 1   Download

The study presents thermal structure and active-passive tectonic parts of the Eastern Mediterranean Region. Curie point depth, heat flow map, Moho depth and sediment thickness are used for interpretation. The levelled magnetic data that obtained from the World Digital Magnetic Anomaly Map (WDMAM) is used. The magnetic anomaly is divided into 39 zones for Curie point depth estimation. The Curie point depth values are calculated into Fourier domain. Then heat flow map is generated. The estimated Curie point depth values are ranging from 4.5 km to 25 km.

16p tanmocphong 29-01-2022 9 0   Download

Knowledge of heat flow density on the Earth’s surface and subsurface temperature distribution is essential for the interpretation of several processes in the crust such as for the evaluation of the geothermal potential of a region. With this study, we investigate the conductive heat flow distribution in western Anatolia to understand the thermal state and its relationship to regional tectonics in the region. The new heat flow data are collected and combined with previously published data to obtain the new heat flow map of western Anatolia.

17p tanmocphong 29-01-2022 8 1   Download

This study analyzed comparative cross-section secondary data from 756 households systematically selected in two chosen districts (Kersa and Omo Nadda) of Jimma Zone, Oromia Regional State, Ethiopia in 2018 by our research team. The data used was obtained by interviewing mothers/caregivers using a pre-tested structured questionnaire.

7p thebadguys 15-01-2022 10 0   Download

Comparison between the calculated and experimental results covering molecular structures, assignment of fundamental vibrational modes, and thermodynamic properties were investigated. The optimized molecular geometries were compared with the experimental data obtained from X-ray data of a similar complex, which indicated that the theoretical results agree with the corresponding experimental values. The UV-Vis spectrum of the compound was also recorded and some properties, such as HOMO and LUMO energies and λmax , were determined using DFT (PW91) method.

12p langthannam 29-12-2021 20 0   Download

A facile synthesis of a series of new 5-bromotropono[c]pyrazole derivatives (3 and 10–15) as well as 5- bromotropono[c]isoxazole (17) is described, involving a condensation reaction of 3-acetyl-5-bromotropolone (1) with hydrazine monohydrate (2), arylhydrazine hydrochlorides (4–9), and hydroxylamine hydrochloride (16), respectively. All the synthesized compounds were obtained in good yields of 56%–77% and their structures were characterized by spectral data and HRMS.

7p langthannam 29-12-2021 7 0   Download

Some thiazole derivatives bearing dithiocarbamic acid esters were synthesized in order to investigate their anticandidal activity and cytotoxicity. The structures of the obtained final compounds (6a–j) were confirmed by spectral data (IR, 1H NMR, 13C NMR, and MS) and elemental analysis. The anticandidal activity of the compounds was determined (6a–j) using the microbroth dilution method and their cytotoxicity was evaluated according to the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay against normal cells.

10p langthannam 29-12-2021 8 1   Download

The synthesis of novel, symmetrical, tetrasubstituted metallophthalocyanines (cobalt, zinc, and copper) bearing four 2-{[2-(dimethylamino)ethyl](methyl)amino} ethoxy units was reported. The dinitrile derivative was converted into the water-soluble quaternized product by its reaction with methyl iodide. The quaternized zinc phthalocyanine was obtained from the reaction of the water-soluble dinitrile derivative with zinc acetate. The structures of the newly synthesized molecules were proposed according to elemental analysis, 1 H NMR, FT-IR, and UV-Vis spectral data.

8p langthannam 29-12-2021 5 0   Download

In addition, the novel bis-(1,2,4-triazole-3-thione) was reacted with the appropriate hydrazonoyl chloride in dioxane under reflux in the presence of triethylamine to give the corresponding bis-(1,2,4-triazolethiohydrazonoate). The structures of the new compounds were established based on elemental and spectral data. The mechanism of the studied reaction was also discussed.

15p langthannam 29-12-2021 4 0   Download

The compounds were characterized by analytical and spectral methods. In addition, X-ray diffraction was performed to characterize and obtain detailed information about the structure of 3. The fully optimized geometries of compounds 3 and 4 were calculated at different basis sets by using the Gaussian09 (G09) software to investigate their 3D geometries and electronic structures. Comparisons between the calculated and experimental data including molecular structures, fundamental vibrational modes, and electronic properties were made.

17p langthannam 29-12-2021 12 0   Download

A general synthetic method was improved to synthesize a chemosensor based on a tripodal Bodipy (t-BODIPY) structure. The product and its intermediate products were successfully prepared and fully characterized. The metal ion sensing performance of the tripodal compound was evaluated by UV/Vis and fluorescence spectroscopies. According to the obtained data, t-BODIPY is a selective and sensitive fluorescence probe for detection of Cu2+ ions in the presence and in the absence of competing ions. This chemosensor presents relatively a low detection limit of 5.4 x10–7 M for Cu2+.

33p langthannam 29-12-2021 7 0   Download